Fishing Line Motion Sensing With Magnetic Coupling and Sealed Sensors
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Solution Overview
Problem
Electronic fishing bite detectors face challenges in protecting sensitive components from liquid damage and mechanical stress while maintaining sensitivity and reliability, especially in wet environments, and there is a need for improved theft protection and user convenience.
Innovation Solution
A detector system with a first sensor magnetically or optically coupled to a moving guide on the fishing line, accompanied by a second piezoelectric vibration sensor, which allows for increased design freedom and sensitivity, and magnetic coupling reduces the risk of liquid damage and mechanical stress, while additional features like remote control operation and adjustable sensitivity enhance user convenience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sensor is directly coupled to the moving guide to detect line motion, then the sensitivity and measurement precision are improved, but the sensor becomes vulnerable to liquid damage and mechanical stress
Solution Approach 1:
A magnetic field is introduced as an intermediary between the sensor and the moving guide. The sensor detects magnetic field changes caused by the moving guide's motion without direct physical contact, eliminating liquid damage risk while preserving motion detection capability
Solution Approach 2:
The direct mechanical coupling between sensor and moving guide is replaced with a magnetic field-based detection system. This substitution eliminates mechanical stress on the sensor while maintaining the ability to detect line motion through magnetic field variations
2Reliability
If the sensor is enclosed in a sealed dry space to protect from liquid damage, then the reliability is improved, but moving seals are required which increase device complexity and maintenance needs
Solution Approach 1:
The magnetic field acts as a mediator that allows the sensor to remain in a sealed environment while still detecting motion of the moving guide. The magnetic field penetrates the sealed enclosure, enabling contactless detection
Solution Approach 2:
Mechanical moving seals are replaced with a magnetic field-based transmission system. The magnetic field can pass through the sealed enclosure without requiring physical openings or moving seals, simplifying the device structure
3Device complexity
If the sensor is placed outside the dry space to avoid seals, then the device complexity is reduced, but the sensor becomes vulnerable to mechanical damage from violent line motion
Solution Approach 1:
The magnetic field serves as an intermediary that transmits motion information from the moving guide to the sensor without requiring the sensor to be in the path of violent line motion. The sensor can be positioned in a protected location while still detecting motion through magnetic field changes
4Device complexity
If a single sensor is used to detect line motion, then the device complexity is reduced, but the reliability and sensitivity are compromised
Solution Approach 1:
Two different sensing modalities (magnetic field detection and piezoelectric vibration sensing) are merged into a single integrated system. The sensor assembly detects both rotational motion through magnetic field changes and vibrational motions through piezoelectric effects, improving overall reliability and sensitivity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system provides improved reliability and sensitivity by decoupling sensors from mechanical stress, reduces liquid damage risk, and offers enhanced user convenience through remote control operation and adjustable sensitivity, effectively addressing the challenges of protecting sensitive components and improving detector performance.
Implementation Method 1
the first sensor is magnetically coupled to, or configured to optically monitor, the moving guide
Implementation Method 2
the first sensor is magnetically coupled to, or configured to optically monitor, the moving guide
Implementation Method 3
the second sensor comprises a piezoelectric vibration sensor
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A sensing device comprising a first sensor (20), a housing (34) surrounding the first sensor, and a moving guide (40) adapted to contact a fishing line (50), wherein the first sensor is magnetically coupled to, or configured to optically monitor, the moving guide, and the first sensor is configured to detect motion.